A230815 Number of nX4 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero

0, 0, 12, 174, 816, 12210, 108006, 1202184, 11797696, 124336446, 1262910682, 13078190344, 134042691720, 1381544758264, 14197831448766, 146130421941262, 1502841078520490, 15462124587630982, 159048324563923546

Offset

1,3

Comments

Column 4 of A230819

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 95

Formula

Empirical recurrence of order 95 (see link above)

Example

Some solutions for n=4
..0..2..1..0....0..1..2..0....0..1..0..2....0..2..1..0....0..1..2..0
..1..0..1..2....2..1..0..1....2..2..0..1....1..1..0..2....2..0..0..1
..2..0..1..0....1..1..0..2....1..1..0..2....2..0..0..1....1..0..2..2
..1..0..2..1....0..2..1..0....0..2..0..1....0..1..2..0....0..2..1..0

Crossrefs

Sequence in context: A366235 A239335 A120662 * A099930 A307549 A052208

Adjacent sequences: A230812 A230813 A230814 * A230816 A230817 A230818

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved